Punch



Aug. 11,1942. 1.. c. HUFF PUNCH Filed Nov. so, 1940 2 Sheets-Sheet 1 1122221120124 Z1 m ar a/r v Aug. 11, 1942. 7 c, HUFF v 2,292,693

PUNCH I Fild Nov. 30, 1940 2 Sheets-Sheet 2 .i 1.11; II I Patented Aug. 11, 1942 PUNCH Lyman C. Huh, Chicago, 111., assignor to Universal Oil Products Company, Chicago, 111., a corporation of Delaware Application November 30, 1940, Serial rim 367,992

' 13 Claims.

The invention relates to an improved form of punch of the general'type comprising a holder and one or more removable punching members,

such as used, for example, on presses, pilling machines and the like. With removable punches and particularly those of relatively small diameter or cross-section, it is the usual practice to make the'shank of the punch which fits into the holder larger than the punching end which protrudes from the holder. This practice involves a waste of material (that turned or otherwise removed to reduce the diameter or cross-section of the punch at one end thereof) and becomes quite expensive as applied to the numerous classes of service in which the punches must be made of relatively costly metals or metallic alloys. There is also a pronounced tendency, particularly with small punches of this conventional class, to break off closely adjacent the point at which the diameter is reduced. p

The present invention overcomes-both of the disadvantages above mentioned. The waste of expensive metal-or metallic alloy of which the punching member is formed is obviated by employing a rod type punch "of-substantially uniform cross-section throughout its length. The,

tendency for breakage of the punch to occur is greatly reduced by a novel construction of the punch holder which reduces the strain at any This rib is somewhat narrower than the diameter or maximum cross-section of the punch and is so located in relation to the punch and the openthe punch holder between the buttresses formed by the rib may be readily grasped with pliers or the like and drawn from the holder.

The features and advantages of the invention will be more apparent with reference to the accompanying drawings which comprises Figures 1 to 18 inclusive.

' therein.

ing in the holder into which the punch is inserted that it forms a buttress on two sides of the punch. With this construction, the contact line or edgeof the opening where it meets the Punch is interrupted and disposed at different elevations rather than circumscribing the punch at a single elevation. I have found that this Figure 5 is a view of the lower end of the punch holder and punches shown in Figure 4.

Figure 6' is a cross-sectional view of the holder and punches of Figure 4 and is taken along the plane indicated by line 66 in Figure 4.

Figures 7, 8 and 9 each represent an end view, similar to the end view shown in Figures 2 and 5, of different specific forms of gang punch holders embodying features of the invention.

Figures 10, 11 and 12 are elevational views of the lower portion of( the punch holders and punches illustrated in Figures 7, 8 and 9, re-

spectively. I

Figures 13 to 18 inclusive are elevationalyiews representing modifications ofeach of the several specific forms of punch holders shown in the other figures of the drawing.

Referring now to Figures 1, 2 and 3, the punch holder is designated by the reference numeral l and, in this particular instance, accommodates a single removable punch 2 which is of substantially uniform diameter throughout its length and has an upper portion inserted in a substantially central opening 3 provided in the punch holder and a lower portion which protrudes from the lower end of the holder. Thepunch is retained in plac'ein the holder by a suitable set screw 4 and may, when desired, have a flattened occurs, will ordinarily'be at or adjacent the lower edge of the rib and the stub of the broken punch which protrudes from the relatively flat face of 5:;

portion 5 at the point where the set screw engages the punch.

Except for the rib B at the lower end of the holder, the latter may be of any conventional or special form and no novelty is claimed for the particular construction illustrated at the upper end I, by means of which the holder is retained in the reciprocating plunger of the particular punching or pilling machine in which it is used. As illustrated in Figures 1 and 2 the rib Ii at the lower end of the holder protrudes from the face of the latter and extends diametrically across the latter except for an opening through the rib in alignment with opening 3 in the main body of the punch holder. It will be noted that y II is of the same general form illustrated Figures 1, 2 and 3, except that it accommodates two punches, the latter being here indicated, as in Figures 1, 2 and 3, by the reference numeral 2.

Set screws again designated, as in Figures 1 and 3, by the reference numeral 4 are set into the holder at an angle to engage the punches and retain them in place.

As indicated in Figures 5 and 6, the two removable punches are disposed at spaced points on a diametrical plane through the holder H and pass through the diametrical rib 16 which protrudes from the lowerface of the holder. .The rib I6, like the rib 6 of Figures 1 and 2, is of somewhat smaller width than the diameter of the punches and forms buttresses which contact opposite sides of the latter, breaking the line of juncture of the punches with the holder.

Referring now to Figure 7, which is an end view of a punch holder similar to that illustrated in the preceding figures except that it accommodates three punches of the same general form as punches 2, the openings 23 in this holder, which latter is designated by the reference numeral 2|,

are disposed 120 degrees apart and equidistant from the longitudinal center line of the holder. Three radial ribs 26 protruding from the lower face of holder 2| are disposed 120 degrees apart, the ribs being disposed in the same radial planes as the openings 23. These ribs 26 are of the same general form as the ribs 6 and I6, respec-- tively, of the preceding figures and serve the same purpose,. each rib being somewhat smaller in width than the diameter of the openings 23. In Figure '7, an, approximate angular position of the set screws 4, which hold the punches in place in openings 23, are shown by dotted lines.

Referring now to Figure 8, the four-punch holder 3| here illustrated in end view is provided with four longitudinal openings 33 for removable punches of the same general form as punches 2 in Figures 1 to 6 inclusive.

being disposed 90 degrees apart and equidistant from the longitudinal center line of the holder. The four radial ribs 36 of Figure 8 are of the same general form as the ribs 6, l6 and 26 of the preceding figures and are disposed 90 degrees apart in the same radial planes as openings 33.

Referring now to Figure 9, which represents an end view of a six-punch holder 4| having six longitudinal openings 43 for six punches of the same general form as punches 2 of Figures 1 to 6 inclusive; the openings 43 are disposed-60 degrees apart and equidistant from the longitudinal center line of the holder. In this particular instance, the rib 46, which serves the same purpose as the diametrical or radial ribs illustrated in the preceding figures, is concentric with openings 43 and These openings 33 like the ribs of the preceding figures is somewhat smaller in width than the diameter of the openmgs.

Figures 10, 11 and 12 are elevational views showing the lower ends of the punch holders illustrated in Figures 7, 8 and 9, respectively, and corresponding reference numbers in Figures 7, 8 and 9 and in Figures 10, 11 and 12, respectively, refer to the same parts.

Referring now to Figure 13, this view illustrates a single punch and punch holder like that of Figures land 2; except that it employs a modified form of buttress for the punch. The holder l' is of the same general form as holder 1 of Figures 1- and 2 and the punch 2 is of the same general form as the punch 2 of Figures. 1 and 2. The buttress'B' on one side of the punch corresponds to one side of the buttress 6 in Figure 1, but the buttress 6" of Figure 13 on the opposite side of punch 2 protrudes a shorter distance from the punches here illustrated are like the holder and punches illustrated in Figures 4 and 5 except for the rib or buttresses which, as in the construction shown in Figure 13, contact the punches on opposite sides thereof at different elevations. The holder in Figure 14 is designated by the reference numeral H and the punches are designated by the reference numeral 2. The diametrical rib which buttresses the two punches on opposite sides thereof comprises two relatively short outer buttresses l6" and a single relatively long central buttress 16'. The difference in elevation between the points where the buttresses l6 and [6" contact the punches is again indicated at E in Figure 14. I

Referring now to Figure 15, which illustrates a modified form of three punch holder like that illustrated in Figures '7 and 10 except that long and short buttresses are employed as in Figures 13 and 14, the punch holder is designated by the reference numeral 2| and each of the three punches are designated by the reference numeral 23'. There are three relatively short buttresses 26" comprising the outer ends of the three radial ribs which contact the punches, although one of these outer buttresses does not appear in this particular view. The central portions 26' of the three radial ribs protrude farther from the face of the punch holder than thebuttresses 26" and the difference in elevation of the portion 26' and 26 of the ribs where they contact the punch is indicated in Figure 15, as in Figures 13 and 14,

at E.

Referring now to Figure 16, this view illustrates a four-punch holder like that shown in Figures hand 11, except that the four radial ribs which buttress the punches have relatively short and relatively long portions contacting opposite sides of the punches, as in Figures 13 to 15 inelusive. The punch holder in Figure 16 is designated by the reference numeral 3| and the punches are designated by the reference numeral 33'. There are four relatively short buttresses 36" comprising the outer ends of the four radial ribs and the central or inner portion 36' of each of the radial ribs protrudes further in the face of the punch holder than the portions 36", the difference in elevation between buttresses 36' and 36" at the points where they contact opposite sides of each of the punches being again indicated at E..

Referring to Figure 17, the construction of the holder 4|, here, illustrated, is like.that shown in Figures 9 and 12, except that the circular rib which buttresses each of the six punches 43' on opposite sides thereof comprises relatively short portions 46" between each alternate pair of adjacent punches and longer portions 46' between each of the other alternate pairs of adjacent punches. Thus, each punch is buttressed on its opposite side at a different elevation, this difference in elevation between the portions 46 and '46" of the circular rib where they contact the punches being again indicated at E.

In Figure 18, another modification of the same the rib, extending from the face of the holder and intersected by the punch when the latter is in place in the holder.

2. In combination with a punch holder provided with a plurality of longitudinal openings therein for the reception of removable punching members, a rib extei .ing from the face of the holder and intersected by each of said punches when the latter are'in place in the holder, said rib being narrower than the maximum dimension of the punches where they intersect the rib.

3. In combination with a punch holder provided with a plurality of longitudinal openings therein for the reception of punching members, a

general type of holder illustrated in Figures 9 and 12 is illustrated. The holder 5! of Figure 18 accommodates six punches 53, only three of which appear in-this view and is provided with a circular rib concentric with the punches and comprising the buttresses 56, one of which is disposed between each adjacent pair of punches. The bottom surface of each of the buttresses 56 is disposed at a slight angle from the horizontal so that the buttress on one side of each punch conmay be designed to accommodate any number of punches. Neither the specific location of the punch or punches in the holder, nor the specific location of the ribs is a limiting feature of the invention, except that the ribs are so disposed in relation to the openings provided in the holder for the punches that each of the punches is buttressed on opposite sides by the rib or ribs and such that the ribs function to break or interrupt the circumferential line of contact between the punches and the holder which would be obtained in the absence of the ribs. It will be apparent that a concentric rib, such asthat illustrated in Figures 9 and 12 or in Figures 17 or 18, may be employed with a two, three or four-punch holder, as well as with a holder having a greater number of punches and, conversely, radial ribs, such as illustrated in Figures '7 and 10, 8 and 11, 15 or 16, may be provided on holders for more than four punches. It is also within the scope of the invention to employ gang punches and holders therefor having a plurality of spaced concentric ribs.

The term "punch or punching member, as used in the foregoing specification and appended claims, should not be interpreted as limiting the invention to members which pierce or make indentations or openings, since the invention specifically contemplates the adaptation of its feaplurality of ribs extending from the face'of the holder in a plurality of radial planes and each intersected by at least one of said punches when the latter are in place in the holder, said ribs, where they are intersected by the punches, being narrower than the maximum dimension of the punches at the points of said intersection.

4. Incombination with a punch holder'having an opening therein adapted to receive the shank of a punching member, a rib extending from the face of the holder and intersected by the punch when the latter is in place in the holder, that portion of therib where it meets the punch on one side of the latter protruding a shorter distance from the face of the. holder than its portion which bears against the punch on the opposite side thereof.

5. In combinationwith a punch holder provided with a plurality of longitudinal openings therein for the reception of punching members,

a rib extending from the face of the holder and intersected by each of said punches when the latter-are in place in the holder, said rib having vation than the portion thereof which bears against the opposite side of the same punch.

7. In combination with a punch holder having an opening therein adapted to receive the shank of a punching member, a rib extending from the face of the holder and intersected by the punch when the latter is in place in the holder, that portion of the rib where it meets the punch on one side of the latter protruding a shorter distance from the face of the holder than its portion which bears against .the punch on the opposite side thereof, those portions of the ribs which bear against the punch being narrower than the latter at the same elevation.

8. In combination with a punch holder provided with a, plurality of longitudinal openings therein for the reception of punching members, a rib, extending from the face of the holder and intersected by each of said Punches when the latter are in place in the holder, said rib having portions which bear against the punches at different elevations on opposite sides of the latter, said portions being narrower than the punches at the points where they bear against the same.

9. In combination with a punch holder provided with a plurality of longitudinal openings therein for the reception of punching members, a

plurality of ribs extending from the face of the holder in-a' plurality of radial planes and each intersected by at least one of said punches when the latter are in place in the holder, each of said ribs having a portion which bears against one side of the intersecting punch at a different elevation than the portion thereof which bears against the opposite side of the same punch, said portions of the ribs where they bear against the punches being narrower than the latter at the same points.

10. An apparatus of the class described comprising a punch holder, a punch extending outwardly, from the face of the holder, said holder contacting and laterally supporting the punch about the entire perimeter of the latter at said face, and buttressing members for the punch which extend outwardly from said face a shorter distance than the punch, said buttressing members being disposed to contact the punch on only two opposite sides thereof and each buttressing member contacting and supporting the punch over substantially less than half of the punches perimeter.

spaced apart and extending outwardly from the buttressing members for said punches on said holder, the buttressing members extending from said face of the holder a shorter distance than the punches and being disposed to contact only two opposite sides of each punch, each buttressing member contacting its associated punch over substantially less than half the perimeter of the latter.

12 An apparatus of the class described comprising a punch holder, a plurality of spaced apart punches retained in place in openings provided in said holder and protruding outwardly from the face of the holder, said punches being contacted and laterally supported by the holder about their entire perimeter at said face, and ribs extending ina plurality of radial planes from the face of the holder a shorter distance than the punches, each rib being intersected by at least one of said punches and buttressing the latter on opposite sides thereof over substantially less than its entire perimeter.

13. An apparatus of the class described comprising a punch holder, a plurality of spaced apart punches extending outwardly from the face of the holder, and a substantially circular member extending from .said face of the holder a shorter distance than the punches and buttressing the latter over substantially less thanthe entire perimeter of each punch.

LYMAN C. HUFF. 

